HDFS-3880. Use Builder to build RPC server in HDFS.  Contributed by Brandon Li and Junping Du


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1507579 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1380921 from trunk for YARN-84. Use Builder to build RPC server.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1507582 13f79535-47bb-0310-9956-ffa450edef68
svn merge -c 1507259 from trunk for HADOOP-9756. Remove the deprecated getServer(..) methods from RPC.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1507586 13f79535-47bb-0310-9956-ffa450edef68